Je was op zoek naar: sliding (Engels - Kinyarwanda)

a sliding-block puzzle game
a funga insobe

first of all you can switch the sound on or off (might be useful in class rooms). you can also set the sliding speed of the teacher's and student's line.
bya byose hindura i ijwi ku cyangwa bidakora (in urwego:). gushyiraho i umuvuduko bya i na umurongo:.